Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 93
Fig. 119. must lie on Ah (§ 36). Moreover, since c is in the line B, c*must lie on Bh. Hence c* is at the intersection of Ah and B\ Similarly, the F-projection of c, c, must lie at the inter-section of Av and B. But since ch and c are two projectionsof the same point, they must lie in the same… … Fig. 120. with the common projection. Such lines are either intersect-ing, as in the figure, or parallel (§ 92). X, § 95] LINES IN A PLANE 73 95. Test for Intersecting Lines. Conversely, if the correspond-ing projections of two lines intersect in the same projector, thelines in space intersect. The…
Geometry, Descriptive
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